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Scientists Finally Provide Relief For Depression By Locating Exact Target for Deep Brain Stimulation 

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Scientists Finally Provide Relief For Depression By Locating Exact Target for Deep Brain Stimulation 
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Although it was a small study on 10 patients, researchers at the University of Texas Health–Houston were able to achieve something long out of reach, locating the G-spot where brain stimulators can make a real difference for depression patients.

Deep brain stimulation (DBS) resulted in metabolic brain changes over the 12 months following implanting of the device, making it a strong potential therapy for treatment-resistant depression, according to the new study.

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“This is something that people have been trying to do for a long time, but we have not always been very successful with using DBS for psychiatric illnesses,” said first author Christopher Conner, MD, PhD, a former neurosurgery resident at UT-Houston and current fellow with the University of Toronto.

“But this PET study shows that we’re altering how the brain is functioning long term and we are starting to change the way brain starts to organize itself and starts to process information and data.”

For years, DBS has been used to treat patients suffering from movement disorders such as Parkinson’s disease, tremor, and dystonia—but also has been studied as a possible treatment for patients with treatment-resistant depression.

In DBS, electrodes are implanted into certain brain areas, where they generate electrical impulses to affect brain activity.

However, finding what part of the brain needs to be targeted to treat depression long term has been challenging.

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The new method targets the superolateral branch of the medial forebrain bundle (MFB), which is linked to reward and motivation.

“We targeted a bundle of fibers that leave this small area in the brainstem to travel to other areas throughout the brain,” Conner said. “The PET scans indicated that this small target area has very diffuse downstream effects. It’s not one single effect because there’s not one single area of the brain linked to depression. The whole brain needs to be changed and through this one small target, that’s what we were able to do.”

Researchers performed an initial PET scan before the DBS procedure on the 10 patients in the study for a baseline image. They performed additional PET scans at six and 12 months to assess changes after treatment. Scans of 8 of the 10 patients showed a response.

“A responder to the treatment means that your depression potentially decreases at least 50%; you’re feeling much better,” said co-author João de Quevedo, MD, PhD, professor in the Department of Psychiatry and Behavioral Sciences at McGovern Medical School. “So, for patients with severe chronic treatment-resistant depression, decreasing our symptoms by half is a lot.”

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“It’s the difference between being disabled to being able to do something. Correlating with the PET image changes, our patients reported that their depression lessened after the treatment.”

De Quevedo, who is director of the Treatment-Resistant Depression Program, published the paper this week—with co-authors Dr. Jair Soares, MD and Albert J. Fenoy, MD—in the journal Molecular Psychiatry.

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